I havent found a date either but there is a Lot number on each bottle. That number may vary from year to year. If I remember correctly, its a light marking, almost like a water mark that you have to hold at the right angle to a light to see.
Words of Wisdomfrom Joe Dressner on the bottle marking.

Bill Buitenhuys wrote:I havent found a date either but there is a Lot number on each bottle. That number may vary from year to year. If I remember correctly, its a light marking, almost like a water mark that you have to hold at the right angle to a light to see.

I found it! I just bought the last five bottles at a local shop a few days ago. It's on the front label, just to the left of the words "sparkling wine" underneath the producer name. I would call it 'embossed'--it's pressed into the paper. Mine, FWIW, are L052.

My wine shopping and I have never had a problem. Just a perpetual race between the bankruptcy court and Hell.--Rogov

Marc, two different lots in the same town? Wouldn't have expected that. Now we just have to find out what's in each. And I wonder if 052 and 053 correspond to approximately the same blends as last year's 042 and 043, meaning the latter has more poulsard.

My wine shopping and I have never had a problem. Just a perpetual race between the bankruptcy court and Hell.--Rogov

Jenise wrote:Marc, two different lots in the same town? Wouldn't have expected that. Now we just have to find out what's in each. And I wonder if 052 and 053 correspond to approximately the same blends as last year's 042 and 043, meaning the latter has more poulsard.

My first 4 bottles came from slough foods, and they are long gone. I never looked at them to see the embossed #. The rest were from food pavillion on fairhaven parkway, these have L053.

Howard, Poulsard is one of the blending grapes in the sparkling wine, with gamay. I think they grow it in the Jura as well as Savoie/Bugey.